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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20fb8f4eb41c74226f229e9b889c9bbf340d040a8b4af02f6e3a5da56693ca8a' 
  AND token = 'Cj2Anr28Cs84dOiCy2tk2kF1ANOjIKDnD1kTIJcvaFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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