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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9bd9d95c06558ff6a56c0a8d137864cbd39ddd588baf11c349a3741649514b' 
  AND token = 'Xk0OzbeT2m+6rDOnyU6wy+TvT5Al+YrH8bTcRyRgBEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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