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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf35a945b90a185c4b6072eabb83f29f6593556948a33cfaf7cf503482fc42cf' 
  AND token = 'hrSOlzQUiubLurcCPjq8ObaOwOp0Yvi3r9dflF9jVvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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