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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c999667a576dadf66864963faed3a2de562a060d3b6d75eed764e4724ade1c77' 
  AND token = 'Z50SDik6AlTDi6UZ7gzS5JDNuz3vYRGN2vvBchNWdC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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