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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c72adb267ac13a681f48e3d40c6b0a669a8a0bdcafb2346f02c064b5f2b7ce5' 
  AND token = 'rPPZ4BQdTRai1UyzzaFDxJQQoW9H4RS/S1Yxk3Lxxcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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