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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60dcbb9972fbf4dec3f13baf355e9240b2e2da1d390db6656fdb5c6738d39b6b' 
  AND token = 'MOhYxj2WKbzhF9KeoF8EyZNnM3Iu1Abzu29hnt5/K6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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