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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2887c0584e119b3aba1c1cbbe7528f6ded9afe6d1124232687a72b16d05643d' 
  AND token = 'o1fAGpHGSiOwmHIrBBsez1Xe/XBKR3sotsBK5WJ1GiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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