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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095a07ee79ad26aabc970b9feae179da98befb3a898e2c7856207ddd09f3794d' 
  AND token = 'qxK96DeSoApFubp9NPV/GfcXEyuzYRjxjJH+spIpIJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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