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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ff77b9944c6a07ca8ba947e07273749aadda396e59d0b228a6d3a41147ea04' 
  AND token = 'AiNieUJohdwSrUttW8Z7JKDAGJmFLWYO4GWi2EZerIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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