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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76450fa073a60452ba11c8e1c1b42d7e46712c80c6bbf82a9d61fee51f4d0ea' 
  AND token = 'OFZyrC6UkVR4264VqA04CKN7uelRNviGCmLl59FxcYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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