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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcce0bf1efb2a4cf37952dfbc29d69e48c1d5c4f4ff6d69ed291d00ef6143be' 
  AND token = 'fq6xQ0Kgds+zr0A2hR6CKiZKi0/XW+cvXFBrS7eWm9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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