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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1700eecdc54eb60d4e8054fbc32e7c45649425defddf18f312f66446bbc6e7ce' 
  AND token = 'PADCYa742iVEv2kDYLIHim43VD1ppLPynfhiwJnO15M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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