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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af92ca227248a0771753ec38ed904f8c7a0ddaf6334cf32d105316d67a36cf0' 
  AND token = 'rEjPCvU217phb7f+Lk3Qoz1sBiF4+PviVQDg+bmLoFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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