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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0091c1633ea5cda445f90e7b719e504bafbd4ac5c69d28b009f1914b813f5886' 
  AND token = 'wrXPSoB7kyFl9RqDNc++ujjafZpXWo0+nzOm8ysO1ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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