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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bfda1730b32dcebeb4b196efb478d73e91d7fd69fc4487b895e3c5a7f0f6c6' 
  AND token = 'aj6YZQ8zDEfI7wK803Lp3sOpjPC+ad2RvU4vcgxqXYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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