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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fb6c1a0048c18164b8a288a7d04e7ffafc7d66d09016d1f4be6e219497c8ff' 
  AND token = 'En/57LrePybMN8L7uNqlafwFvZiNC2RNBI8kpdRrSKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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