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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6b7bb31ad40133ac79aa64d3763d959a7ead31aaed4fc04696c0dd78a5bfde' 
  AND token = 'CM5lkmL1wA20E4wqzv7ybAR2QDIr4viWwBxg4tJTANE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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