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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5908db87e781ceccb6105151759ed598ec2cdcd712e9e5bc5f259ca2e0bd5b5' 
  AND token = 'y3yZvDW+3q1rE5pAWmpKc0DZWohLwZwTgSRx8U7phEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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