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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c583dd31c36eeeb8c37d86be3171452a26d84f43caf64afdf70eaeff6b0bad3a' 
  AND token = '+QjQYZFC3otgCdC2s0GOjIlWdUH26TxDh107J6LHnTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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