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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1b3571a6d016a8b15fb54e7a58fbabcc0076ff6b844fc31c1d937e5d5d808d' 
  AND token = 't0lRuZ7SyAy0+YCxcbEpjsRbywH3FPjjpFZr8ndfgdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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