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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac68cb134ad815f5c86287d2e1bafc4fe256d26dde0eb8c85de920a172bb3265' 
  AND token = 'ljEPxImWjFJCd9R7brNQ0uJAs6q4z/cGlmvUT8NUgH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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