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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aebd7a6e50d3f39bb28719c71728bf2225261dbb555159fd1305d74e3ee076f' 
  AND token = 'PAtJyWukck/6Tamct4bqoeNY63SfksEzLpa7f6NN/UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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