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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ae7a1491c7409bc67511c0eab95c1f8601c9a69bac3a320d86fdc85a65f062' 
  AND token = '23XZoJQWXDStxNrqgsk0r8lJq4u+3omS+q+siC/HLFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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