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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be582e96dcf4d8034295e0268a679d6542b831cc15df5ade20a840eea8c186da' 
  AND token = 'zm+lBZqekAJHE+eE1cSim8zkDPROUHYnoORT2w1W0/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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