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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecddbc0a02f747b0a1eabc15329bcfafa4564f2ceb2b0f19087a0fe843f9a935' 
  AND token = '+He6cS6JvHS1DBquDpBowsKQoc4K4CAI2EbHZHbeMG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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