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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71137fa5bca930c5bba019fe8b99d512dd6b4b061338346e880124dcb4e8927f' 
  AND token = '5tiKEpizyERMXvM7Cbce/8w/tkrH/m/nwrBFSI8MKEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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