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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c1299843dbbeec753fc28fce56d668398dd548c23a4571c0ad3ebbe6fb9284' 
  AND token = 'gkOHHawaS1418y2azr4UrfFYYCFqvTaXF+SZ+ss5blE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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