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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37d3532cbd7b2e390e4e20f50d7683bc1fb9d160bf16b119e6b28cac7bbb503' 
  AND token = '9WaL1Vw8sji0WaCbPCXxvBWLdy0Ci0H2iYPgfx1ZfW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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