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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babf66025c8996f202b62612f00e9eee08df8986f655bd09324bb3a3b4a3fd09' 
  AND token = '2kexYZ3I1LC0oqfzefdoZGEcISz9u7ej13tO/XRyrsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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