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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaff9954a0840fa06f40df5aae103fe2a2ac40c54e67507ca0a8ed6140097826' 
  AND token = 'qeZMXLUoPKVMijbEkOX8H4GWz/AYCLQEhyKtoaAVH7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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