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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7830db7a1bf180f2ed5427745e24d1f41abaed4300cfff5910bd01d77cc8026' 
  AND token = 'O9hDxcfFEtDMdHyi3Hq4GpgWznH6UcQ/b4SCpYr87Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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