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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9918b08eac6cb6d503633911e5708c8ff9ac5d8317cee4a4bea0826317df8e21' 
  AND token = 'zrH2r1i0gV+f5yymRfzQf3qMjcWt6ZoNiThzdR933yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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