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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0de09c2415a3afa82e8b52cbeb7b371ec9994b262329675d4d9cdd460f205f' 
  AND token = 'NQC6p+ybK3DNqA6BxWmObT0+lDq8x7y8ZI+X8Sialao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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