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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21248a7d9b3798b29b1af277456c5e47ae9d879d94336cb19895edbb3134c0c' 
  AND token = '2mBVBEIqrnlgro9BdOSPDalr+t6kr6KR8yx9DycSTis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}