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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58a60ba0c97f0c3267ee21e290ae3ac1555050891034b63a7667997494c0a65' 
  AND token = 'cVLactNp2JIzbcXRvy+W5+TMclcpWpy5PWiT+9oKSNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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