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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07e47ffa6a884aa8e38106bfe703b9d2e2c3d241b674dc40773d06ed8be3e40' 
  AND token = 'J+Se0kOXTTMD4jdMBK6X7W9gBJOZa9o39ev4sbScPcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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