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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049e52e005296e23147136ac53cb861cabbdef838e90e34866388cc28772105e' 
  AND token = '1Q94qrcKBvmtu1gZUZmcGEJOx5t+ODlhMvyayVbNfdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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