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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58e6de9e52da0e7869d6b96fa2dc88ae846798a97d888c4b7026ab9a0648364' 
  AND token = 'K6hpoMkmASnazakXBCesG/r6eTEcjWD6YleUBmYTIqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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