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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df661dcbda8074182b33ee2ce3ef8a12205c3155a51bfa1f5114db2107d9ef33' 
  AND token = 'OjNgQ0Z9/VDTTMFDEH8GPz916iT+U1VMKqpMMAUo3SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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