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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5587709bab75e66c86bf0d2404fa9e475aaf82e30021bf324f59519ff597a775' 
  AND token = 'JSUWhih5T1yDe72FVeOyYqpguwKmhjXIqViVBeXbe1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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